Question: Is there a database explorer that can handle large and complex databases with ease?

If you need a database explorer that can handle big and complicated databases, Azimutt is worth a look. It's got an interactive command-line interface for understanding and manipulating database structures. Azimutt supports a variety of database types, relational and document-based, and has features like scalable ERD, path finding and collaboration tools. It also has secure diagram sharing and embeds with customizable access controls.

Another contender is SingleStore, a real-time data platform for petabyte-scale data sets. It combines transactional and analytical data in one engine, supports multiple data models, and has high-throughput streaming data ingestion. SingleStore is good for intelligent applications, real-time analytics and SaaS applications, with a usage-based pricing model and a free tier.

If you're already using PostgreSQL, Xata is a serverless data platform that should be easy to integrate into your existing workflow. It includes serverless Postgres, zero-downtime schema migrations, full-text search, AI integration and a collaborative dashboard. Xata's free tier has generous storage and query limits, so it's a good option for growing projects.